Modelling of Transient CO₂/Water Flow in Wellbore considering Multiple Mass and Heat Transfer

Table 1

Criteria of gas/liquid flow pattern transition.

Flow pattern	Criteria
Bubble flow	or and
Slug flow	and
Churn flow	and
Annular flow

Note that is the superficial velocity of gas phase, m/s and is the superficial velocity of liquid phase, m/s.